Granted Patent
Utility
US 4,964,539 · App. 07/334,071
Multiple chamber dispensing container and closure system
Inventor:
Bruce M. Mueller
Patented Case
View Patent ↗
Granted: Oct 23, 1990
Filed: Apr 6, 1989
Inventor
Bruce M. Mueller
Assignee (at issue)
Seaquist Closures
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.